/* ===========================================================================
   CHROME — navbar, view routing, fullscreen mode
   Everything that frames the games but is never part of one.
   =========================================================================== */

/* ===========================
   NAVBAR
   =========================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: var(--z-nav);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
}

/* --- Brand: "Sriram4N." collapses to "S4N." on scroll --- */
.brand {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  cursor: pointer;
  text-decoration: none;
  min-width: 0;
  flex-shrink: 0;
}

.brand .letter {
  display: inline-block;
  transition: opacity 0.4s var(--ease-out),
              max-width 0.4s var(--ease-out),
              margin 0.4s var(--ease-out);
  max-width: 1em;
  opacity: 1;
  overflow: hidden;
  white-space: nowrap;
}

.brand .letter.collapsible {
  max-width: 0.9em;
}

.navbar.collapsed .brand .letter.collapsible {
  max-width: 0;
  opacity: 0;
  margin: 0;
}

.navbar.collapsed .brand .brand-n {
  text-transform: uppercase;
}

.brand .brand-dot {
  color: var(--accent);
  margin-left: 1px;
  transition: opacity var(--transition-fast);
}

/* --- Nav links --- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-links a {
  position: relative;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* --- Nav actions --- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--toggle-color);
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  box-shadow: none;
}

#theme-toggle:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  transform: scale(1.05);
}

#theme-toggle .sun-icon { display: none; }
#theme-toggle .moon-icon { display: block; }
[data-theme="dark"] #theme-toggle .sun-icon { display: block; }
[data-theme="dark"] #theme-toggle .moon-icon { display: none; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  box-shadow: none;
}

.nav-hamburger:hover {
  background: none;
  transform: none;
  box-shadow: none;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===========================
   VIEW ROUTING
   =========================== */
.view {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  min-height: calc(100vh - var(--nav-height));
  min-height: calc(100dvh - var(--nav-height));
  padding-top: var(--nav-height);
  transition: opacity var(--transition-base);
}

.view[hidden] {
  display: none;
}

.view.active {
  animation: fadeIn 0.35s var(--ease-out);
}

/* The menu is a scrolling page; a game view is a centred stage. */
#view-menu {
  justify-content: flex-start;
  padding-top: 0;
}

.view:not(#view-menu) {
  justify-content: center;
}

/* ===========================
   BACK BUTTON + EXIT BUTTON
   =========================== */
.back-button {
  position: fixed;
  top: calc(var(--nav-height) + 16px);
  right: 24px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-full);
  cursor: pointer;
  z-index: var(--z-chrome);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast), transform var(--transition-fast);
}

.back-button:hover {
  border-color: var(--game-accent);
  color: var(--game-accent);
  transform: translateY(-2px);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
}

.exit-button {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: var(--z-exit);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(10, 14, 24, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: none;
  transition: background var(--transition-fast), border-color var(--transition-fast),
              transform var(--transition-fast);
}

.exit-button:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: none;
}

/* ===========================
   FULLSCREEN MODE
   A game takes the whole viewport; the site chrome steps out of the way.
   =========================== */
body.fullscreen-mode .navbar,
body.fullscreen-mode .footer,
body.fullscreen-mode .back-button {
  display: none !important;
}

body.fullscreen-mode {
  overflow: hidden;
}

body.fullscreen-mode .view {
  padding-top: 0;
  min-height: 100vh;
  min-height: 100dvh;
  justify-content: stretch;
}

body.fullscreen-mode .game-shell {
  max-width: 100%;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  padding: 0;
  gap: 0;
}

body.fullscreen-mode .game-shell__head,
body.fullscreen-mode .game-tools {
  display: none;
}

body.fullscreen-mode .arena {
  flex: 1;
  width: 100%;
  height: 100%;
  border-radius: 0;
  border: none;
  box-shadow: none;
  margin: 0;
}